A null reference pointer was passed to the stub

[Rifolino]

Hello,
I worked with DesignCad15 and the samples SDK-Delphi-Samples (Delphi6)worked well.
After I have installed DesignCad17 I get with some of the Delphi-Samples the Error "A null reference pointer was passed to the stub" when I am comiling the delphi-samples.
For example the sample HATCHTEST
The error "A null reference pointer was passed to the stub" appeares here:
      SetLength(HatchObj, 11);
     DcHatch.DrawType := dcHatchDefault;
Does anyone has an solution for this problem?
Thanks
Regards
Rifolino

[DrollTroll]

Hrmmm... just tried it, worked fine for me.

Did you change the code to
GetActiveOleObject('DesignCAD.Application.17')
and
CreateOleObject('DesignCAD.Application.17')
?

Otherwise it may be trying to target the wrong (possibly not-installed) version of DesignCAD...

[dcadRob]

Could this be caused by linking to the wrong type library in the Delphi program?

[DrollTroll]

That is a possibility. I suggest removing DesignCAD_TLB from your uses clauses, then re-import the type library, making sure it's for the correct version, and add back in your DesignCAD_TLB uses. Mark where you save the imported _TLB.pas file, also -- you may need to adjust your directory paths in the project options.

[Rifolino]

Thanks dcabRob and DollTroll,
You gave me the correct advice. It was the wrong library.
Regards from Germany!
Rifolino